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error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change
--> $DIR/feature-gate-concat_idents.rs:5:13
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LL | let a = concat_idents!(X, Y_1);
| ^^^^^^^^^^^^^
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= note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
= help: add `#![feature(concat_idents)]` to the crate attributes to enable
error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change
--> $DIR/feature-gate-concat_idents.rs:6:13
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LL | let b = concat_idents!(X, Y_2);
| ^^^^^^^^^^^^^
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= note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
= help: add `#![feature(concat_idents)]` to the crate attributes to enable
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0658`.
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